#!/usr/bin/python3
import pathlib
from typing import List, Optional

from ansible_module.generic import SYSTEMD_NETWORK_CONFIG, Types, joindict, modspec, systemdbool
from ansible_module.module import SystemdUnitModule

kinds = (
    "bond",
    "bridge",
    "dummy",
    "wireguard",
    "vlan",
)

matchspec = dict(
    host=Types.str(help="hostname of the host that is matched against"),
    virtualization=Types.str("Virtualization that is checked against"),
    kernelcmd=Types.str(help="checks an kernel commandline argument"),
)

netdevspec = dict(
    description=Types.str(help="Description of the device"),
    name=Types.str(required=True, help="name of the device"),
    kind=Types.str(required=True, help="type of the device", choices=kinds),
)

bridgespec = dict(
    stp=Types.bool(help="enable the stp protocol"),
    priority=Types.int(help="Priority of the bridge"),
)

bondspec = dict(
    mode=Types.str(
        help="bonding policy",
        choices=("balance-rr", "active-backup", "balance-xor", "broadcast", "802.3ad", "balance-tlb", "balance-alb"),
    ),
    minlinks=Types.int(help="Specifies the minimum number of links that must be active before asserting carrier."),
)

wireguardspec = dict(
    privatekey=Types.str(help="private key of this side of the tunnel"),
    privatekeyfile=Types.path(help="Path of the private key on the host."),
    port=Types.raw(help="Port that wireguard uses to listen for packets. the value 'auto' means that the port is automatically decided."),
)


class Module(SystemdUnitModule):
    """Creates an netdev unit that creates an virtual devices"""

    name = "netdev"
    module_spec = modspec(argument_spec=joindict(bondspec, bridgespec, matchspec, netdevspec))
    _common_args = dict(
        supports_check_mode=True,
        add_file_common_args=True,
    )

    def prepare(self):
        self.__unit = None
        self.unitfile = SYSTEMD_NETWORK_CONFIG.joinpath(self.get("name")).with_suffix(".netdev")

    def unit(self):
        if self.__unit is None:
            kind = self.get("kind")
            parts = [self.match(), self.netdev()]
            if kind != "dummy":
                parts.append(getattr(self, kind)())
            self.__unit = "\n".join(parts)
        return self.__unit

    def match(self) -> str:
        options = self.map_param(
            host="Host",
            kernelcmd="KernelCommandLine",
            virtualization="Virtualization",
        )
        return "[Match]\n" + "".join(options)

    def netdev(self) -> str:
        options = self.map_param(
            description="Description",
            name="Name",
            kind="Kind",
        )
        return "[NetDev]\n" + "".join(options)

    def bond(self) -> str:
        return "[Bond]\n" + "".join(
            self.map_param(
                mode="Mode",
                minlinks="MinLinks",
            )
        )

    def bridge(self) -> str:
        return "[Bridge]\n" + "".join(
            self.map_param(
                stp="STP",
                priority="Priority",
            )
        )

    def wireguard(self) -> str:
        port = self.get("port", False)
        if port not in (False, "auto") and (port < 1 or port > 65535):
            raise ValueError("Port must be between 0 and 65536")
        return "[Wireguard]\n" + "".join(
            self.map_param(
                privatekey="PrivateKey",
                privatekeyfile="PrivateKeyFile",
                port="ListenPort",
            )
        )

    def vlan(self) -> str:
        return ""


DOCUMENTATION = """---
description:
- Creates an netdev unit that creates an virtual devices
module: netdev
options:
  description:
    description:
    - Description of the device
    required: false
    type: str
  host:
    description:
    - hostname of the host that is matched against
    required: false
    type: str
  kernelcmd:
    description:
    - checks an kernel commandline argument
    required: false
    type: str
  kind:
    choices:
    - bond
    - bridge
    - dummy
    - wireguard
    - vlan
    description:
    - type of the device
    required: true
    type: str
  minlinks:
    description:
    - Specifies the minimum number of links that must be active before asserting carrier.
    required: false
    type: int
  mode:
    choices:
    - balance-rr
    - active-backup
    - balance-xor
    - broadcast
    - 802.3ad
    - balance-tlb
    - balance-alb
    description:
    - bonding policy
    required: false
    type: str
  name:
    description:
    - name of the device
    required: true
    type: str
  priority:
    description:
    - Priority of the bridge
    required: false
    type: int
  stp:
    description:
    - enable the stp protocol
    required: false
    type: bool
  virtualization:
    required: true
    type: str
short_description: Creates an netdev unit that creates an virtual devices
"""

if __name__ == "__main__":
    Module()()